How are we doing on this patch?
> Hi all,
>
> This patch allows ALTER TABLE/DROP CONSTRAINT to drop UNIQUE constraints by
> dropping the relevant index.
>
> This is a prelim patch that I need comment on (The @@ comments), and I've
> edited some things out by hand, so I don't recommend applying it to anything
> just yet.
>
> I have added an IsIndex function to indexcmds.c and a RemoveUniqueConstraint
> to heap.c, plus modified command.c's AlterTableDropConstraint function to
> call RemoveUniqueConstraint.
>
> Note that I have disabled inheritance support for unique constraints - since
> it's impossible to have two indices of the same name anyway...
>
> Comments please.
>
> Chris
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